That beautifully renovated kitchen. The extra bathroom tucked off the master bedroom. The sleek deck overlooking the garden. They all look great in the listing photos, but here's the question almost no buyer thinks to ask: was any of it actually consented?
Unconsented work is one of the most common, and most expensive, surprises buyers encounter in New Zealand property purchases. A good building inspection won't replace a council search, but it plays a critical role in flagging the kind of inconsistencies that send you looking for answers before you're locked into a contract.
What Counts as "Unconsented" Work
Under the Building Act 2004, most building work needs a building consent from the local council — this covers structural changes, plumbing and drainage alterations, electrical work tied to the building's systems, re-cladding, re-roofing, and adding or removing internal walls. Some minor work is exempt under Schedule 1 of the Act (small sheds, certain low decks, some fences), but anything that affects the structure, weatherproofing, or services of a home generally needs sign-off.
When that consent process is skipped, the work becomes "unconsented" - and it can stay invisible for years, especially if it was done neatly.
Why It Matters More Than Buyers Expect
Unconsented work isn't just a paperwork issue. It can create real financial and practical problems down the line:
No Code Compliance Certificate (CCC) — meaning the council never confirmed the work meets the Building Code
Insurance complications — insurers can decline claims related to unconsented alterations, or refuse cover altogether
Finance and resale friction — banks and future buyers' lawyers often flag unconsented work during due diligence, which can stall or derail a sale
Retrospective consent costs — fixing the paperwork after the fact usually means applying for a Certificate of Acceptance (CCA), which can involve invasive inspections (cutting into walls to check wiring or framing) and isn't guaranteed to succeed
Safety risk — work done without consent hasn't been independently checked, which matters most for structural changes, wiring, and plumbing
In short: the listing photos show you the finish, not whether it was ever signed off as safe and compliant.
